Bought late in 2018 and van only has 2600 miles on it, half city-half highway. Started a local 15 mi round trip with only 2 stops. At about 11 mi into trip, nearly had a heart attack from the sudden red, flashing warning in the dash about super high operating temperature. Immediately pulled to shoulder and shut off engine. After getting heart rate back to somewhat normal, restarted engine and still in red. Called Chrysler emergency and had vehicle towed to dealer. Dealer puts it on computer, diagnostics show nothing--no history, no error codes, etc. "But, by the way, both your primary and auxiliary batteries were bad so we replaced them, we just can't figure out why it overheated." They ran the engine on the lot, drove it for 20+ mi, and everything functioned "as expected." So....I pick up the car, drive the exact same route home as before, watching the actual temp readout the whole way. Things seemed fine, temp fluctuated 200-220, with minimal increasing over 5-6 miles. Driving speeds varied from 40-55 mph with a few stoplights. Then things got bizarre. I watched the readout increase 5-10 deg each time the car made a hard turn, left or right, but it didn't decrease. After the 5th hard turn, temp readout rapidly increased to red zone within ~300 yds, yes, yards. Any thoughts?